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    The 10 Most Annoying Sounds and Why They Bother Us

    WebMD Health News
    Reviewed by Louise Chang, MD

    Oct. 12, 2012 -- The sound of nails on a chalkboard or screams may send shivers down the spine for a good reason.

    A new study shows annoying sounds trigger a highly emotional response in the brain.

    Researchers found the part of the brain that regulates emotions, the amygdala, appears to take over the hearing part of the brain when people hear an extremely annoying sound.

    "It appears there is something very primitive kicking in," says researcher Sukhbinder Kumar of the Institute of Neuroscience at Newcastle University in Newcastle upon Tyne, U.K. "It’s a possible distress signal from the amygdala to the auditory cortex."

    The results suggest that a heightened emotional response in the brain to certain unpleasant sounds may alter people’s perception of them.

    The Most Annoying Sounds

    Using functional magnetic resonance imaging (fMRI), researchers looked at activity in the brains of 13 healthy volunteers when they heard a range of 74 different sounds.

    The participants rated each sound from most annoying or unpleasant to pleasant.

    The results, published in the Journal of Neuroscience, show the top 10 most unpleasant sounds (and you can click on the first five to hear the sound):

    1. Knife on a bottle

    2. Fork on a glass

    3. Chalk on a blackboard

    4. Ruler on a bottle

    5. Nails on a blackboard

    6. Female scream

    7. Disc grinder

    8. Squealing brakes on a bicycle

    9. Baby crying

    10. Electric drill

    On the other end of the spectrum, though, are the least unpleasant sounds among the group. They are:

    1. Applause

    2. Baby laughing

    3. Thunder

    4. Water flowing

    What Makes Sounds Unpleasant

    The study shows that activity in the amygdala and auditory complex varies according to the perceived unpleasantness of the sound.

    When listeners heard an annoying sound, activity in the amygdala increased and took over regulation of the auditory part of the brain.

    Researchers say this spike in emotional activity heightened people's perception of annoying sounds compared with soothing ones, like bubbling water or a baby laughing.

    The study also shows that sounds in the higher-frequency range of around 2,000 to 5,000 Hz were rated as most unpleasant.

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